I don't see a damper on your exhaust pipe? I was asking the OP if he could post a pic because I've noticed that as outside temps dropped below 30, my old stove without damper would start pulling too much draft and all the heat went up the chimney. It didn't matter how much wood I piled in.In one house - 1400sf ranch, I have a little stove - VC Resolute Acclaim. Placed in almost center of house. Temperate climate of North AL/South TN. Lately, has been 21*F at night with highs at 40*F daytime. Little stove keeps it real toasty by feeding it every 4-5h - 80* near stove and 70* in farthermost BR.
A little stove will work if 1. you place near center of house and 2. you can feed every 4-5 hours. Overnight, I may get 6-7 hr of usable heat.
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As soon as I added a damper, I could control the draft while running the stove wide open.